their Recent Paper " On Holicella, Firussac." G25 



'' Subgenus CapilUfera, Honigmaun, 1906 " (p. 179) tliere 

 liad been included (p. 180) " Section 4: Perforatella, Schliiter, 

 1888." The latter will, therefore, become the name for the 

 subgenus, CapilUfera being reserved, as before, for section 1. 

 Similarly, the " Subgenus t/ocos/a, Gray, 1821 " (p. 183) and 

 " Genus IJelieopsis, Fitzinger, 1833 '^ (p. 181) must exchange 

 rank. 



Monackella, proposed by us (p. 179) in lieu of Monncha, 

 proves to be preoccupied for Aves (Sulvadori, Ann. Mus. Civ. 

 Genova, vi. 1874, p. 82). We now propose to substitute for 

 it Monachu'idefi. 



Trochoiden, Brown, 1827, was referred to by us in a note 

 (p. 183), when pointing out tliat it had been improperly 

 employed tor Helix elegans, Gmelin, under the erroneous 

 belief that that species was a synonym for the Trochus 

 terresiris of Pennant. The latter, however, was undoubtedly 

 the same species as the Helix fulva of AJiiller. It has, there- 

 fore, been suggested to us that Brown^s Trochoiden should 

 have appeared in the synonymy under Petasina, Beck, 1847 

 (p. 177). We think it should not, as will become apparent 

 from the following succinct history of the name : — 



Pennant, i.i 1777 (Brit. Zool. iv. 8vo ed. p. 127, fig. 108), 

 described and figured under the name of Trochus terresiris a 

 shell that was undoubtedly the Helix fulva of Miiller. DaCosta, 

 1778 (Uist. Nat. Test. Brit. p. 35), described but did not 

 figure a *' Trochus terrestrisj Listeri," which is also obviously 

 the H. fulva,lsV\x\\. Lister, of course, gave no such name, 

 but his " Buccinum parvum, sive trochilus sylvaticus," &c., 

 is evidently the same thing. Montagu, in 1803, introduced 

 confusion ino the case. On the one hand ('J'est. Brit. p. 287), 

 lie gave Irochus terresiris, citing Pennant as above and also 

 Listv.r's (liist. Conch.) t. 61. fig. 58, which is clearly the 

 H. elegans of Gmelin. On the other hand {op. cit. p. 427, 

 pi. xi. fig. 9), he created Hdix trochiformis, under which he 

 cited Da Costa's " Trochus ierrestris, Listeri," and reference 

 to Lister's "Plist. Anim. Angl.," adding Helix irochulus, 

 Miillevj which, however, is now held to be the young form of 

 Ena obscura. Brown, in 1827, followed in Montagu's foot- 

 steps, for he has (Illust. Conch. Gt. Brit. pi. xl. fig. 2) the 

 Helix trochiformis, Mont., which is manifestiy Ai filler's /w/ua, 

 and also his own Trochoidea terrestre (op. cit. pi. xli. fio-s. 80 

 & 81), cited as of Montagu (not as of Pennant direct), whilst 

 his accompanying figures are evidently inventions, for they 

 were not taken either from Pennant or from Lister's " Hist. 

 Conch.," nor do they resemble either fulva or elegans. In 

 the second edition of his work Brown (p. 46, pi. xvii. fig. 2) 



